Integer Overflow or Wraparound Affecting google-guest-agent package, versions <20250116.00-0ubuntu1~20.04.0+esm3


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.53% (42nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-GOOGLEGUESTAGENT-16800574
  • published17 Jun 2026
  • disclosed22 May 2026

Introduced: 22 May 2026

CVE-2026-39834  (opens in a new tab)
CWE-190  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 google-guest-agent to version 20250116.00-0ubuntu1~20.04.0+esm3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream google-guest-agent package and not the google-guest-agent package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.

CVSS Base Scores

version 3.1